I get it—sometimes you’re at a barbecue and the only tool you have is your thumb. You can actually use the “hand test” to feel for doneness. Press the fleshy part of your palm just below your thumb with your other index finger.
Now relax your hand. The squishy spot there is what raw lamb feels like. Bring your thumb to your forefinger tip, and feel that same spot again—that’s medium-rare. Middle finger to thumb? That’s medium. Pinky to thumb? That’s well-done, and frankly, please reconsider.
